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WorksheetsEcosystems Unit Review Vol. 2
Total questions: 14
Worksheet time: 11mins
Which statement best describes how organisms get their energy?
Decomposers get energy directly from the sun.
Consumers eat only other consumers for energy.
Consumers eat only producers for energy.
Decomposers feed on decaying organisms and wastes for energy.
In a forest ecosystem, trees provide a habitat for both birds and squirrels. Acorns from oak trees are an important food source for squirrels. Berries and seeds from shrubs and plants are an important food source for birds. Suppose several trees are cut down and the land is cleared to build a shopping center and a parking lot. How might cutting down trees and clearing the land change the forest ecosystem?
Squirrels and birds will lose their habitats.
Soil erosion might occur because trees and other plants are removed.
There will be less food for squirrels and birds to eat.
All of the above are possible changes to the forest ecosystem.
Uwharrie National Forest is a forest ecosystem in the Piedmont region of North Carolina. There are balanced populations of plants, animals, and fungi. Suppose a flu-like disease kills almost all of the owls and hawks during the winter. The owls and hawks that survive will leave the forest in order to find new mates in the spring.
Which of the following is most likely to occur with the owls and hawks gone?
More young mice will survive and become adults.
There will be more trees and grass.
Red foxes will stay for a while then leave to find the owls and hawks.
The insect population will decrease (get smaller).
What is the purpose of a food web?
It is a visual representation that shows the flow of oxygen and carbon dioxide in an ecosystem.
It is a visual representation that shows how nitrogen is used by plants and animals in an ecosystem.
It is a visual representation that shows how producers use sunlight and carbon dioxide in the process of photosynthesis.
It is a visual representation that shows overlapping food chains and all the paths energy can take in an ecosystem.
Hurricanes usually cause flooding in Eastern North Carolina. Heavy rainfall and runoff cause rovers to carry more freshwater than usual down the river to the salt marshes and estuaries near the coast. The additional freshwater eventually flows into the ocean.
How might heavy rainfall and flooding affect ecosystems in Eastern North Carolina?
Flooding will only affect plants in the salt marshes, estuaries, and shallow areas of the ocean.
Flooding will affect the organisms and the salinity of the salt marshes, estuaries, and shallow areas of the ocean.
Flooding will only affect animals in the salt marshes, estuaries, and shallow areas of the ocean.
The flooding will not affect the salt marshes, estuaries, and shallow areas of the ocean.
Rabbits eat field grains such as wheat and oats. Great horned owls eat rabbits. Bacteria feed on the wastes of organisms and decaying (nonliving) organisms.
Which would most likely cause the population of great horned owls to decrease (get smaller)?
An increase (more) in the number of field grain plants
A decrease (less) in the number of bacteria
An increase (more) in the number of rabbits
A decrease (less) in the number of rabbits
Some aquatic (water-based) ecosystems are a mixture of fresh water and salty water. They are rich in nutrients and provide a good environment for the offspring of many fish and shellfish.
Which ecosystem is best described by the characteristics above?
A pond ecosystem
A forest ecosystem
An ocean ecosystem
An estuary ecosystem
How do forest and grassland ecosystems compare?
They have temperatures that vary based on their locations on Earth.
They receive the same amount of rainfall each year.
They are dark because they are shaded from sunlight.
They have poor soil (not rich in nutrients).
How do ocean and pond ecosystems compare?
Oceans are shallower than ponds.
Oceans include freshwater and ponds include saltwater.
Oceans include more diverse organisms (plants and animals) than ponds.
Ponds are large bodies of water divided by continents.
Which statement best describes an ecosystem?
An ecosystem is all the organisms of the same kind in a particular area.
An ecosystem is a forest or an ocean.
An ecosystem is all the living and nonliving parts of the environment and how they interact with each other.
An ecosystem is any organism, such as algae.
Grass - Grasshopper - Frog - Raccoon - Bacteria
Using the food chain above: Which organisms in the food chain are best classified as consumers?
Grass and grasshopper
Grasshopper and frog
Grasshopper, frog, and raccoon
Raccoon and bacteria only
Grass - Grasshopper - Frog - Raccoon - Bacteria
Which organism in the food chain is best classified as a decomposer?
Grass
Frog
Grasshopper
Bacteria
Grass - Grasshopper - Frog - Raccoon - Bacteria
Suppose a chemical spill kills most of the frogs in the ecosystem. Which of the following is most likely to happen?
Some raccoons will leave in search of another food source.
The raccoons will begin to eat grass.
The grass will dry up and turn brown.
The population of grasshoppers will decrease (get smaller).
Grass - Grasshopper - Frog - Raccoon - Bacteria
Which population would most likely increase (get bigger) if a chemical was used to kill insects and most of the grasshoppers in the ecosystem died?
Raccoons
Grass
Frogs
The loss of grasshoppers will not affect other populations in the ecosystem.
